Ford 1999 Wagon-Econoline Owner's Manual page 181

Maintenance and care
To install the new bulb:
1. With the flat side of the bulb's
plastic base facing upward, insert
the glass end of the bulb into the
lamp assembly. You may need to
turn the bulb left or right to align
the grooves in the plastic base with
the tabs in the lamp assembly. When
the grooves are aligned, push the bulb into the socket until the plastic
base contacts the rear of the lamp assembly.
2. Install the bulb retaining ring over the plastic base until it contacts the
rear of the lamp assembly by rotating clockwise until you feel a "stop."
3. Install the electrical connector into the rear of the plastic base until it
snaps, locking it into position.
4. Install the headlamp assembly into the vehicle and secure it with the
clip tabs.
5. Turn the headlamps on and make sure they work properly. If the
headlamp was correctly aligned before you changed the bulb, you should
not need to align it again.
Replacing front parking lamp/turn signal bulbs
1. Make sure the headlamp control is in the OFF position.
2. Open the hood.
3. Rotate the bulb socket
counterclockwise about ¼ turn and
remove.
4. Carefully pull out the bulb
straight out of the socket and push
in new bulb.
5. To complete installation, follow the removal procedures in reverse
order.
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